$E_{ij} = \frac{(\text{Row Total} \times \text{Column Total})}{\text{Grand Total}}$

$E_{ij} = \frac{(\text{Row Total} + \text{Column Total})}{\text{Grand Total}}$

$E_{ij} = \text{Row Total} \times \text{Column Total}$

$E_{ij} = \frac{\text{Grand Total}}{(\text{Row Total} \times \text{Column Total})}$